/vr/ - Retro Games

So, I've never made a WAD before, but I'd like to start on a gameplay mod that just adds some extra rules and a scoring system to the regular game. Could someone point me in the right direction to get started? Even if you just link some reading material, it would be really helpful.

I did check the tutorial page linked in OP, but I didn't quite see what I'm trying to do. I'm not going to change the weapons or monster behavior or anything. I'm just trying to add a time limit, scoring system, high score board, and a credit/continue system.

Any pointers at all would be greatly appreciated.